[問題] 國中理化平面鏡與聲納?
1.若平面鏡靠牆之夾角70度,人站在平面鏡面前,請問像與
水平面夾角幾度?
答:50度
2.一艘船甲之速度為45m/s,收到發出聲納後十秒,另一艘船乙之速度
為100m/s,直直向他靠近,請問甲.乙兩艘船的距離為若干?
答:6790 m (海水聲速=1500 m/s)
請問各位理化高手 小弟感激不盡!
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